I am weird ???️?That's really weird.
Why on earth didn't you just politely pass or if the singletrack was too narrow let them know you weren't bothered about getting past?
There are tons of Pro riders round my way. They're just folk who ride bikes like you or me. only difference is it happens to be their day job.
I think I was embarrassed and unsure of ..., Etiquette ! ...
If I'd been running I'd have thought nothing of going past. I was new to MTB/EMTB and it just seemed wrong for my lazy whiring motor ass to breeze past some peeps working their asses off. ??
Now.... I think I would ride with them and share some of my extensive knowledge on how not to ride.