I'm not 100% sure the title is self explaining, so here comes the explanation....
I'd bet that most users are aware that even if you ignore a certain user; you can still see a specific post from that user if you c,lick the "Show/Hide button"
Why would someone want to read a post from an ignored user? Well, there are plenty of reasons; and that's not the main topic here, so I'll leave it up to each user to make some thinking and have the answer to this.
Now, what's the problem (I see) with that button? See screenshot bellow.....
If the text of that post is short enough, it can fit inside the box; but when it has more than a couple of lines of text.... it's unreadable.
So my suggestion is to make that text box bigger. It doesn't have to be the whole post size; but at least something more readable....
The only workaround I know for this is unignoring the user, reading the post, and then ignoring back; and it's kind of tedious to do on small screens from phones (and it recharges the whole site, which consumes data). Let me know if there's another one please.