There is no way to see if someone else has raised a flag against your content. If you aren't harassing another user with comments, or ignoring warnings from the mod team that your comments have crossed a line you may not have been aware of, you have no reason to worry.
The Help Center says:
What happens when I flag a comment?
In addition to bringing the comment to the attention of the moderators, a sufficient number of flags on a single comment will cause it to be deleted automatically. The number of flags required for deletion varies based on the number of votes on the comment, as well as the content of the comment itself.
And an faq post on Meta explains everything you might want to know about comment flags.
I have deleted many an intemperate comment that I regretted after I went back and reread it. I'm sure that someone probably flagged them as unfriendly at some point, and it hasn't really impacted me. When I was a moderator I saw a lot of completely innocuous comments flagged as "unfriendly", so when looking at a user's profile, I would rarely look at the number of those flags unless it was really high, and then I would go back and review the content of the comments to see if there was a pattern.