Is it time to split? The leftist community can't coexist with the community of leftists after all, they have too fundamental differences. To not speak of the left vs sinister vs vänster divides
No. Clearly, you're supposed to stick around and yell at people for their beliefs that are close to yours but not quite the same, belittle them, and generally be unpleasant. You get bonus points for ad hominems, ignoring context, and interpreting ambiguous things in a manner as detrimental to civil conversation as possible. /s
Really though, stick around, be civil, agree on things, disagree on others and strive to advance your understanding of personal philosophy and help yourself and others grow.
We have a board game here in Sweden that makes fun of left parties and their tendencies to split over minor issues. It was a huge problem for left parties. It's a rough race for "purity" I guess but keeps the parties small and makes it hard to get any kind of democratic impact when a party divides as soon as it reaches a critical mass. Nowadays most left parties are pretty stable but have deeply entrenched factions inside instead that sometimes focuses more on minutiae (?) rather than unity for the sake of the larger questions and policies.