How can Antara think bad about Raghu after everything they've been through?!
Exhibit A:

Their first meeting. The first time they met Raghu was in the middle of a fight and jumped on Antara's taxi. Talk about bad impression😳 This led them to a series of misunderstandings and Antara thinking the worst about Raghu.
There was also the time Raghu broke all the windows in her house😳 And the whole no water for them thing🤔 All of this made Antara reach one conclusion: Raghu = Bad. Which is why she kept fighting with him and saying people are afraid of him and are too scared to say anything (for those that don't remember, I believe this happened right before Raghu decided no water for the Kauls).
And in the end, Raghu kicked Antara's family out (minus mama mami).
Seriously, Raghu's image in Antara's eyes can't get worse than this😳 I mean, at this point you would hate the person right?
Exhibit B:

Raghu finds out about what happened to Antara and how her mom is unwell. Despite how much he hates Antara, he changes his mind and decides to bring her family back. Why? Cuz he lost his mom when he was a kid and doesn't want anyone to go through that. This starts the rectification of Raghu's image in Antara's eyes. He even saves her from gunde
Of course, she's still mistrusting at this point and thinks he's your typical gunda🤔
Exhibit C:

All Raghu did was bring her to the car cuz it started to rain and the garage roof was leaking. Of Antara being Antara assumes the worst and think Raghu wanted to do God knows what. Raghu quickly clarified things for her and shut her up😆 Then after that Raghu had wanted his shirt back and Antara assumes her wanted something else *cough*.
Seriously though, you have to ask yourself this: Can Satya really make Antara think the worst about Raghu? Based on their history, they didn't get off to a good start. And I think from Exhibit C it's clear what kind of person Antara thought Raghu is. Now that she's gotten to know Raghu and realise how good he is, there's nothing Satya can say or do to make her think otherwise.
What we should keep in mind is that, Raghu has also made mistakes but he has also tried to fix them. He reminded her of her father's death and through away her father's recording. Unintentionally. He never meant for that to happen. When he made mistakes, he tried his best to fix it because he knew he was wrong.

Raghu's actions have changed Antara's views on Raghu. Even though they didn't get along, the man went around town looking for her little brother. Also, Raghu even got Antara's mom to see a specialist. For someone who's supposed to be a "gunda", he seems to be a nice person no? Why else would he do so much?
Doing all that good helped things a bit but not totally. Antara realises that Raghu is not a bad person but why does she trust him? Because when she needed someone by her side, he was always there.
Exhibit D:

I...actually have the dialogues on a siggy somewhere but I'm just too lazy to go back to it🤣 But anyway,
These are the words Raghu said to Antara when he heard her confiding to Noor about how she feels alone and feels like she doesn't have the strength to carry on.
Antara has been trying to stay strong for her family, hiding her tears from everyone and has a huge weight on her shoulders. Ishu is a kid, her mother is sick, her mama mami are doing what they can and Noor misses Dr. Kaul as well. So who can Antara share her pain with? Dr. Kaul was the only one with whom she shared everything and now, there is a void.
At this point in her life, she needed someone to support her, someone to lean on, confide in and lend her strength so that she could stay strong. When she felt like she's all alone, Raghu was the one who comes to console her and made her realise that she's never alone. He is her rock, her pillar of strength. Raghu is the one person she knows she can rely on.

Raghu was not there for Noor's nikah and during that time Antara felt his absence. Before, she went on about her day without caring about Raghu and now, he was missing throughout the day and she felt so alone. This is when we get the full extent of Antara's trust in Raghu and what he means to her. For Antara, Raghu has gone from a criminal/no good gunda to a person who is always there for her and someone she can trust implicitly.
Based on all this, can someone like Satya really cause Antara to think the worst about Raghu? These two have gone through so much that at this point there's nothing Satya can say or do to make Antara hate/dislike Raghu.