I can overlook a few typos and issues because we all make mistakes and don’t catch them all, but if they’re abundant, then it’s hard for me to focus on the plot if I have to stumble on sentences. (It’s hard enough to read sometimes anyway because I’m sure I have undiagnosed dyslexia)
Ironically enough, I dropped a book because, while the plot was interesting, the MC was insufferable. That particular book didn’t have a lot of grammatical issues and typos. I read two other books by the same author that were riddled with them and they had compelling characters and great plot.
I will also say that consistent errors (across several stories) irritate me more than a lot of typos.