Just time your hits, no need to complain about lag/delay. I always fight delayers and laggers, I used to be bad against them, now it's easy to beat them just takes time and practice. Delayers are not impossible to hit, you just have to time your hits correctly based on where you think they will go next (hit earlier than usual to where they will go)

I have always wanted to make a tutorial video on how to spar, but I feel too lazy.