Not all leftists are woke authoritarian. A lot of us are just leftists and we will debate people sometimes. But being willing to debate sometimes doesn't mean I always have the patience to take on all comers, since I am not a professional debater and I also enjoy other activities such as eating pizza, making art projects, writing fiction, spending time with humans I love and sometimes even working at a job. I get really sick of internet randos alleging that I won't debate them (or I'm cutting off a conversation) because I don't have a good argument when in fact I just find their argument illogical or boring and I strongly suspect that debating this person will involve an hour or more of sending links to information that they will dismiss as "fake news" or making ethical or logical assertions which they will flat out deny, leaving us both in the same space we were before we started debating, only now with both of us having wasted an hour of our lives that could have been spent eating pizza.

So yeah, there are shitty leftists that won't debate people because they don't have real arguments. But sometimes if a leftist doesn't want to debate you it's because you're not the greatest debater yourself or they're just actually not in the mood to argue on the internet. Be self-aware. You can't improve other people, but you can improve yourself. And any honest person should have an interest in improving themselves by reading philosophy or long form books on politics/history/etc.