Verbal tactics are and will always be a valid strategy at a live poker table. The best example I can think of is Daniel Negreanu's style, especially a few years back. That said, if we compare Kassouf's behavior to Negreanu's, the least we can clearly and easily notice is that one is pleasant and the other honestly annoying, hence the staff involvement.
I'm not sure if I can qualify Kassouf's acts as cheating, but he was definitely out of line, repeating the same "childish" rubbish over and over, not even funny, nor smart, just purposely depriving the lady of her focus. A harsher penalty would've been more adequate in my opinion.
I don't want to take too much of any reader's time, so I'll just leave you with this illustration of what I consider legit, funny, smart and acceptable verbal tactics.
What do you think of the last one (#1) ?