Not anyone on here but people in general.
Person A: “I will buy [product X]”
Person B: “Don’t buy [product X]. You should get [product Y] instead because…”
Person C: “I’m concerned about your spending habits.”
Person D: “Lol you actually wasted money on that trash? What a dumbass. [Product N] is much superior.”
Person A: “It’s MY money. I EARNED it. I’ll spend it however I WANT.”
Like okay? 
No one is saying it’s not your money. There’s no SWAT team with submachine guns raiding your home and forcing you at gun point to put another item in your cart. It’s like speaking with children but they also pay taxes.
it's all very weird. I guess consumer-brain brand partisanship kicks in after you've made the decision, even before you've actually pulled the trigger.
I do the defensive after-purchase review watching thing, too. can't rationally explain it, but I'll watch more reviews to confirm I bought a good thing than I watched before I bought it. I don't comment though because that is what a freak would do
I think it’s fine to want to reaffirm your opinions on something. Personally I don’t get affected by critique of something I’ll like. I’ll make fun of the person if I think their reasons are dumb of if their analysis doesn’t make sense, but I don’t need a 12 hour essay on dark souls or whatever.