One is not required to investigate the imams wudu and salat to determine whether or not it is valid according to your standards. Rather, one simply prays with the jama'at when the jama'at stands to pray. If one subsequently finds out that the imam did something that none of the four schools, accept, that is another matter. However, even in that case, one would have to be certain that the prayer or wudu is invalid
for the current prayer and one should not assume the mistake was made nor investigate beyond what the shari'ah demands, which is none at all. If the imam does not openly manifest unequivocal kufr or adamantly teaching or commit a mistake that affects the validity of their wudu or prayer
in front of you, then there is no reason to abandon the jama'at. And as far as the sock thing goes, the Hanbalis are more lenient in that matter and it is not as clear cut of a issue as most people otherwise believe.
As far as a sister's jama'at, each person should stick to their madhhab and convictions without causing fitna for the rest of the group by making an issue out of something some of the other madhhabs accept as valid and praiseworthy.
Wa-Llahu `alim wa musta'am
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