Cool source (the second one, the first one fucking sucks I hate it 😁). According to it all mammals have canines, even and especially herbivores. The sabre-tooth water deer for example, cited in your source, has extremely pronounced canines. Still a herbivore. Next!
I mean the source you provided literally says the bottom canines are less pointy and pronounced than the top set, especially in humans, so I don't feel very corrected? You keep at it though, I believe in you!
OP didn't make an argument, OP posted a meme poking fun at people who unironically say things like that. In response the OP of this particular thread unironically said something like that. I'm just having a good time.
Dude if I had a nickel for every dumb prick who pointed at their little bitty canines and said some variation of "see, we have sharp teeth, we're carnivores" I'd have a lot of nickels.
OP didn't create this argument. The world is full of things that have nothing to do with you. Instead of getting bent out of shape about it you can just move along. You don't get the reference? Keep scrolling, it's not for you.