Whether he don't is acceptable in a particular dialect is a dialect specific issue and should be addressed as a separate question. Whether he don't is acceptable in general american Ò€¦ Why is it this is he rather than this is him?

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The case of he/him should depend on other considerations, such as, the proper case after the linking verb, is. It should be simply a matter of which is more correct, it is he or, it is him my Ò€¦ Yes, both (s)he and he/she are acceptable abbreviations for usage where space is at a premium and gender of a person is important. S/he is not a common abbreviation, and will confuse more Ò€¦