Apparently, some people think that Tridha and Harshad are dating and Harshika fanatics cannot take this. So they keep abusing her all the more. Some time back, they were fighting about the ages of the two ladies and Harshad and trying to justify why one deserves to be with him and other doesn't, on the basis of their age!
Like, hello! Why don't people understand that it is only the professional lives of these people that we're privy to. If they share anything about their personal lives, it should be a matter of honour to the fans. What they do in their personal lives is purely their wish. People need to grow up and get a grip.
And there are some people who're just haters. There's another show that I follow and the ML usually posts selfies with the FL. People start abusing her calling her all sorts of names and saying that the ML is better than her! They don't even take a moment to think how awkward would be for them as co-stars. You bash the FL on the ML's account?! Heights of stupidity and ignorance!