To be honest, yeah I have. I've read things as intense as Yamane and Zaria's work on my phone out in public... with the straightest face. (Though I do turn my phone inward a little and glance around to see if anyone is peeking, haha).
At my school? Yesh. In front of the teacher? Yesh. In a public transport? Yesh. at least I probably never read yaoi in a mall. The second one is kinda cringey for me tbh lol.
One reason to not read yaoi in public : Data usage 2 reply
