Why? It is a compliment to have houzzers think your advice is valuable and that they want to keep up with your discussions.

You don't have to follow them.

But, after your description of them as "pesky and not wanted", you may have solved your own dilemma..

https://www.houzz.com/discussions/how-do-i-delete-1-follower-dsvw-vd~1011991

Judy, I think maybe that's how to delete someone you follow.?

Ask Houzz staff in "contact us" at bottom of the page. I have lots of pro followers who are quiet as mice, what is the specific problem?

I don't think people who have chosen to follow you are actively "following" you. They don't really care what you post, nor do they expect you to follow them. There's no sales pitch; it's passive. Have any of your followers been hassling you?