Anti capitalism is just anti capitalism. That's not a theory for how a society free from capitalism should work. Those theories will of course be diverse, and there will be disagreement.
Divide and conquer works for detroying social movements, and is one of the ruling classes favorite weapons of class warfare. It's easy to get agitators to derail the conversation or movement as a whole. There are fundamental differences in what anti capitalists believe should be done and how power should be distributed. I don't believe all leftists think the same thing, but I believe that the vast majority of "leftist infighting" is just agitation by the ruling class.
I am very particular about whom I allow into my circle of trust. That last 6% doesn't seem like much, but it is to me; if you don't believe every Nazi has a backpfeifengesicht, think capitalism should be "tweaked" instead of demolished, or complain about BLM or Pro-Palestinian protestors causing damage, then we're not gonna be best friends.
That being said, that 6% isn't nearly enough for me to consider you the enemy. Billionaires and the fascists they inspire are the enemies, and no attempt they make to divide and conquer us will ever be successful. I will march and scream alongside you in favor of the 94% we have in common.
If that 6% is someone believing the billionaires and fascists are NOT the enemies, then that's a pretty significant 6%... But otherwise, yeah, the rest we can work on