@JoeW I would flag concerning comments. If there are lots scattered about (maybe >5?) I'd use a custom flag that asks a moderator look at other comments by the user.
I did a flag but it got declined, not sure if I just explained it wrong. Though the user has asked a question that I am sure is going to draw a lot of moderator attention
Unless you've already had several flags denied I don't think it's much of a problem to raise additional flags on other comments you see. Sometimes mods make a mistake, or may have a narrower view than you of which comments should be removed