You know, think of it this way, if Dharam Paaji and Sunny WERE NOT popular, noone would base their jokes on them. But because they are, so they are.
And dude, Amir also gets made fun of because he doesn't come to award shows...then there are other stars who turn up for every award show, they also get made fun of, like the non-happening stars.
SRK, the biggest star, gets made fun of, so does Big B, Akki, Salman, Sanjeev Kumar, Amjad Khan, Hema Malini etc etc
have u not heard of "K-K-K-Kiran" or now they've turned it into "K-K-K-Karan" LoL! or the classic "mere paas paisa hai, bangla hai", "Oui Ma!", "Arrey O Samba" etc etc
Don't be hurt by all of this, that's a price you pay for being famous. They will sell more copies, and gain more TRPs by mimicking Dharam Paaji, than say, Harman Baweja or something.
So the more you get made fun of, the more popular you are basically, and noone has lost respect for Dharam Paaji...Sunny Deol perhaps since he has shown no variety in his roles. Just screaming Inqalaab Zindabaad doesn't make an actor, but Dharam Paaji has done ALL sorts of roles, he has a lot of respect in the industry and fans alike.