Yes, anybody can sue anybody for anything, but it seems to be a major part of American culture to actually contemplate anything.
If someone dies due to a heart attack while reading an offensive Fluther comment, can the spouse sue the Fluther moderators for accidental death?
In the US there are about 270 people per lawyer. In Germany it’s 600 people per lawyer. In France it’s 1400 people per lawyer.
That’s quite a strain on the economy and it makes American products and services more expensive. Above all health care.