The only time I think I ever equate the left and the right is that both sides have gotten increasingly tribalist, which this meme ironically proves.

I guess the other time I equate the left and right is in that both sides are very reluctant to hold their politicians accountable for fear of losing to the other side (which is also a result of that tribalism) - even though the left is more willing to say Biden isn't great, they're still giving the DNC a free pass because Trump is worse, and rather than recognising that this election is really Biden's to lose (he just needs to actually tone down on the things that his voter base doesn't like), they're blaming the conscientious objectors who choose to vote their conscience for not being a part of their tribe.

The enlightened centrist meme is a similar issue, where acknowledging any of this qualifies you as being outside of either tribe and therefore also a liability in this game. If it helps, I'm not American and can't vote in your election anyway, so chill out a bit - I'm not losing your election for you (whichever side you're on).

Centrists say the left bit and ask how they are going to do it?

Modern leftists suggest we eat them and when the centrists suggest that might be a little over the top they are villified.