We chat about videogames and videogame accessories.

I could sit here and argue this, but the fact is that I completely underestimated the amount and forcefulness of backlash I would receive from saying keyring Pokémon is dumb, you are all a lot more upset about what I had to say than I was, and I'm just not that invested in having a full-blown argument about it. I don't feel like there is anything for me to gain by participating when everyone has already decided what my opinions are, and that they are wrong. None of you are actually interested in what I think beyond being able to rebuff it the second you hear it...

Although it probably would have been obvious had I thought about it since the game just came out, I didn't realize I would receive such an explosively hostile reaction. It is not my aim to rain on anyone's parade. Cool it.

I think the issue is more that your tone was incredibly absolute and dismissive. If you had given a more even-handed and thoughtful criticism, I doubt it would have been such a big issue, but instead it felt to me like you were arbitrarily insulting something you weren't really informed about, which is Not Good Practice as a general rule.

You're not exactly being all that pleasant now, either; while being confrontational certainly isn't bad in and of itself, you really need to pay extra attention to the strength of your argument and why it matters in such a case.

It is also possibly worth noting that if you spend multiple paragraphs talking about how Not Upset you are, how you Aren't Interested In Arguing, and how Everyone's Getting Worked Up About Something Inconsequential, you are perhaps not presenting the message you intend to.

from saying keyring Pokémon is dumb

If by that you mean "saying an entire game contributed nothing of value to its franchise based on that single keyring, accusing it of plagiarism based on what is already a pretty obvious design, and getting upset when people question whether your opinion is actually founded" then I suppose you're right.