Oh my goodness! If sexist means recognizing that the two sexes are quite different, then of course God is sexist.
If sexist means dealing with the differences in each sex as they should be dealt with, then of course God is sexist.
However if sexist means preferring one sex over another in terms of closeness of relationship, then no, God is not sexist.
Why is it sexist for woman to be quiet in church? Evidently at the time of Paul they were chattering away like magpies -- after all, this was the first time in the history of the Jews at least that women had been allowed in to worship and learn with men!
Physically we are weaker than men for the most part. Emotionally we tend to be stronger. Intellectually we each have our own individual strengths and weaknesses. Men are very focused usually; women can pay attention to lots of things at once (we were BORN to be mothers, LOL).
Acknowledging differences and acting accordingly is only smart, not sexist.