[Aliantha]

If you have housemates they're going to annoy you from time to time.

If you post shit about your annoying housemates on the internet, people are going to give you their opinion.

If you don't like those opinions, ignore them. After all, they're just opinions.

FTR, I don't think UT was suggesting you should adjust your boundaries. I think he was telling you that if you've set your boundaries in such a way that others step on them, it's inevitable that you're going to be annoyed. I don't see him telling you to change them. Only that you decided what they are, and your option is to live with your choice, or change it. He then went on to suggest that he has learned that sometimes it's just easier to change your boundaries/expectations than to wish someone else would change theirs to suit you.