I am well aware that people have, and are entitled to their own opinions.
What I don't understand is the need to ridicule and pity others because the things they enjoy don't match your 'opinion' of what is fun for an adult. That isn't having an opinion, that is just being a rude, obnoxious arsehole.
Calling someone pathetic because they enjoy Disneyland as an adult, isn't an opinion, it's just not very nice.
If your child came home from school and said 'Mum, there's a kid in my class who loves trains, isn't he a weirdo,' SURELY you would reply with something along the lines of 'That isn't a very kind thing to say. Just because that child has different interests to you, that doesn't make him weird.' Would you not? Same rules apply here.
I have absolutely no objection to people saying something like 'Well personally the Disney thing isn't for me, I've never really understood it myself, I'm not much of a Disney fan, but each to their own!' That is having an opinion. Ridiculing others for having different interests is completely different to that though, isn't it.
This actually has nothing to do with me being a Disney fan. The actual subject matter here is irrelevant. I am not reacting in this way because this is about Disney, I would react the same if it was about something that doesn't even interest me. If people were sneering and looking down on others in a thread about stamp collecting, or embroidery or any number of hobbies/interests that aren't relevant to me, I would still think it was totally unnecessary and nasty.