That's not really a great idea. It is contrary to how Steem works to let people unilaterally hide their posts. Every self-voting scammer would use that.

These posts may be ugly, but they are visible and people can decide whether the payouts are good for Steem (vote) or bad for Steem (downvote). Mostly voters are deciding they are good for Steem, albeit ugly.

It could certainly work to have multiple Trending pages one of which allows or self-exclusion, but that's a bit more of a complicated change.