Except posting the latter on a forum 95% of the time implies opinion.You, Sir, tickled my funny bone.
There is a difference between 'I like xy better' and 'xy is better'.
When ppl say the first, there is no need of backing up anything, its their oppinion.
But if they say the latter, its no oppinion its a statement. Statements have to be backed up.
That's the difference between a discussion and an argument.
Y'know, the last forum I was on also went through an "in your opinion" spam phase. We eventually decided against it because it was easier to just infer privately that it was an opinion than to post "in your opinion" one-liners every other thread. And less annoying.