That would depend upon the IO!
Having lived in Thailand for almost 10 years
on a Non-B, I went back to Thailand on my
1st visa-exemption this year and that by land,
left and flew back to DMK 4 months later,
when I got stopped by the IO, who started
to ask me why I had had so many Thai stamps
in my passport. I answered him that it was
just because I had lived in Thailand on a
Non-B for the last 10 years, but then I got
taken to the office, where another officer
that attended me was so rude and arrogant!
All I had to do was fill in a form where I had to
write the reason for visiting Thailand again,
They let me in in the end, with nothing written
or stamped in my passport except the entry
stamp! I was never ever worried that I might
be denied entry, though! No other passenger
was at Passport Control when I got there after
the toilet, so the IO, who seemed young and
unprofessional to me, must of killed his time
by acting bossy to me!
Good luck!