A user is consistently harassing me. I have warned them and they continued
There's very little to add to this moderator comment:
if somebody's rude to you in the comments, there's no internet law that says you have to win the argument. If you see something particularly unpleasant, flag for moderator attention; then disengage. It'll be okay, I promise.
If you feel that you're being harassed, or that some other user is being rude or abusive (or just unwelcoming in some way), this meta isn't a good venue for it. Just flag the comment and disengage.
It's important to note that, while flagging is a privilege obtained at 15 reputation (and lost if you go below that for whatever reason), this is not the case for comment threads where you're participating: if you can comment on a post, then you can also flag comments on that post.
It's probably important to say this explicitly: several of your comments are on pretty gray areas, and they indicate that your side of the interactions has not been blameless either (and that's only with the comments which are currently visible right now). The fact that (you perceive that) others are being rude or abusive does not mean that you can reply with similar stuff. It can indeed be hard to turn away, but it's crucial to do so: flag the comments and walk away. A moderator will be there shortly to resolve the situation, and it won't help if they also have to deal with a lot of stuff from your side of the comments as well.