I doubt you were flagged for that (btw, I have no idea what specific thread you are referring to). As far as I can see very few posts get flagged/deleted. Avoid personal comments, keep saying the same thing again and again, derailing conversations, spam (including cross-posting), adverts especially links to promotions, promoting specific shares (i.e. advice) and you are fine. None of which, as far as I am aware, you do anyway. Read the community guidelines for more detail.
The rational is really simple. This is not a general internet forum - the aim is to move conversations forward in a constructive way and simultaneously steer clear of legal problems.
I am given to believe that the use of four laughing emojis is enshrined in UK’s unwritten constitution 
.