I think some times they want to attack you personally, but they'll find another way to phrase it (find something wrong about the opinions shared). The reason is that they perceive you are a bit hot-tempered and create friction. Most people will camouflage their disagreement with some level of politeness (=political correctness) while you are more direct (perceived as having a shorter fuse and blowing up / escalating pretty quickly)... It's not the content per se (where the disagreement is).

Regarding content anyone might agree, disagree or not even care about something - it's the preference of frictionless interaction that most have and that they don't want it to be "disrupted".

For most (not me), friction in interaction = red alert / danger.

When I see "heated" disagreements etc, I try to see past the discussion and find the deeper substrate of disagreement, and in this case, this is it.