Appearances are nothing. I have seen Torah scholars with shirts tucked out, or putting a chumash under a siddur, or flicking a sefer closed instead of gently closing it.
The first “or” might have been a mistake. Either way, an untucked shirt
is apparently either supposed to be a sign of excellence or something on a level with putting a Chumash under a Siddur* or flicking a sefer closed instead of gently closing it.** I don’t like either of those options, so I’d prefer not to believe that post was sincere. (Actually, the second one doesn’t sound too far off.)
*
Don’t many Siddurim have the weekday leining in the back?
Is it still a problem to put such a Siddur on top of a Chumash?
**
Not bakavodik, to be sure, but how serious a violation
of halacha is it? (Also, familiarity breeds contempt, as they say…)