IF I were to get embarrassed by reading a particular book 'in public', why the hell would I read it 'in public'? I'd read it in the privacy of my home.
What I read in public is really nobody else's business. As long as it's not offending 'public morals', it's ok by me!
When train commuting to/fro work, I read factual books...two I remember clearly, & which onlookers' practically broke their necks' to read titles were......
'Tsunami: The Underrated Hazard' by Prof Edward Bryant (Univ of Woollongong) &
'The Effects of Volcanic Ash on Aircraft'......
Not the normal 'run of the mill' books, but to me absolutely fascinating, as they involved just two of my favourite subjects', Geology & Aviation.