I have always seen sid was more vocal of his possessiveness about vishal than paras.about paras he was kind of sniky that's why at first I never notice his possessiveness towards sana. Now when u guys discuss all this then I noticed his possessive or insecurity in paras matter. But in vishal matter he was quite vocal.like the chumi li na usne ,then he said he will not sleep that side where vishal was sitting,another 2 incident in usud where she was in vishal bed n many other incidents. I think he was mostly insecure because there was many things similar in sana n vishal like both r desi,then vishal is funny n entertaining the kind of entertainer which sana used to like,then beside rashmi sana used to sunao her dukhra to vishal also n he used to listen all that even he used to listen her silly talks or give her attention like sid so I think sid used to feel kind of insecure that vishal can woo sana.that's why in fry pan matter he sided with madhurima because I feel he didn't want madhurima to eliminate n vishal ka rashta saaf ho jaye.as vishal also used to pamper sana lilbit all this can actually impress sana n sid have fear for that somewhere... all this things paras never did.
No wonder Sid hated Vishal like anything šOtherwise Sid never had a strong reason to hate vishal ..that pasta fiasco was not so big enough to hv such extreme hatred ..main reason was sid always knew vishal trying fr an angle with sana š