By long hair I mean chin length or longer.
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Well, what I think is the guy having long hair or not doesn't affect his preference of hair length on women. Means even if a guy has long hair he can still like women who have long hair and yes some guys who have long hair can also like women who have shorter hair compared to them.
However what I believe is 95% of men like long hair on women, may be just 5% of men are such who would prefer women with short hair.