I'm going to disagree with this one. Sometimes I am stating an opinion. Big difference between that and fact I want to make sure that people understand that; especially on the internet where you only have text to communicate. I mean communication is like 80% non-verbal so a lot is lost. I think that it creates a hell of a lot of confusion and leads to a large portion of the pissing contests about stupid crap.
My singular pet peeve is just saying shit that is wrong as if it was absolute fact. I hate it when people use opinion or taste as absolutes about subjective matters, i.e., tone. How many times have you stripped down a great song to the just the guitar part and realized that the "tone" that makes that track great sounds like ass on it's own? It's all about the mix and the entire product. And yes I hate gear bashing of any kind unless it's something that just doesn't work. Even worse is when someone gets obsessed to the point that shit that they own somehow defines them or makes them superior and it comes from both ends of the spectrum. People who spend money on gear look down on people who have less and people who have less love to tell people that pay more for something that they are wasting their money. Then they try to say that there is no difference.
At the end of the day I couldn't give a shit less what you play through or how you sound, what you spend on gear or how you feel about my tone or what I spent. If what I do makes you miserable than that's your problem. If I let it bother me than it's my problem and I have better things to get irritated over so I tend to ignore it. YMMV and IMHO