Because from ages even before this issue sam is consistently nominating either sara, veena or ashmit
and it all started after that week when they didnt voted for him as a caoption.
either u people accept it or not sameer was not happy when he lost to manoj and after that he is irritated from hrishant, sara(got beter later),ashmit and hrishant
he consistently nominates one of them
no matter what the day is, what the week is, and lol most importantly what the reason is
because they thought sameer doesnt deserve to be caption as he is diplomatic(which of course is true and we can see with sameer over reservness). sameer couldnt digest manoj winning over him and he tries to justify his grudge