It's a courtesy, it's considered rude to them if you do it

No it's not just rude, it forcefully breaks the prayer because for a brief moment, they weren't praying to God, they were praying to the person passing in front of them. It's the same reason we can't pray facing a photograph or poster with someone's face on it.

Understood.Will attempt to remember.

I never knew that! I will be sure to be more careful

I had no idea! I'll be more careful from now on

I did not know that. I shall attempt to remember this in an effort to be more respectful.

"Signal Boost"

As a muslim, I love how well the FS community responded to this. You guys are awesome!

Thanks.

Who the fuck cares? They know who they are are praying to, so why does it matter?