He is just immature and very entitled, which you can understand given his heritage and pseudo-stardom since he was like 5.
Doesn't understand the consequences of his actions until they are in his face, at which point, he goes on IG or w.e and puts up a message akin to "haters will be haters; God is on my side and so I choose to believe in love" or some nonsense.
That's where his celebration comes from, post hitting homeruns.
His 'shuffle-step' against Tatis' because he was constantly being compared to Tatis in 2019/2020 (they came up relatively at the same time) where Tatis had great seasons and he didn't.
His 'shh-ing' after 3B is to basically silence all the baseball critics who said he wasn't as good as projected after a mediocre first two seasons.
Both of these started in 2021 (not 2019/2020).
Checking 1B (he started this dumb trend) for check-swings, running to 1B before strikes/balls are called etc. are also pretty annoying
Only good thing about him is he understands that he is not going to simply get by and has shown that he has the work ethic (pre-2021) to excel.
He also understood that at the end of 2021 that he needed to work on his endurance.
I have no idea what he did in the offseason of 21/22, but his answer to the endurance issue is to jog to 1B/no exertion unless absolutely necessary - aka, the Bryce Harper approach. Sure pitchers might have figured out some thing about him, but I still maintain dude just got lazy and didn't build on his 2021, rather defaulted back to 2019/2020.
Might be a generational talent but his attitude is just super worrisome for long-term. Then again, he is 23, maybe he will 'grow up' but sooner than later pls.