Scherzer is like that though. Remember when he started stripping in front of the umps?
Also, Scherzer was already asked to change gloves before the inning. Apparently the first base ump approved the new glove but then inspected again.
Scherzer got pissed, yelled that it was rosin and got ejected. Notice Showalter isn't exactly defending here.
He may end up being ejected for arguing, not for a substance.