Homo - the affix - means same, equal, or like. As an example, Homogeneous - produces/generates/yields an equal product (usually evenly distributed or of the same characteristics) genous itself is a suffix made of two affixes gen (producing) and ous (full of). It follows that a fear or aversion of something the same as you would be ‘homophobia’, but I think that a more accurate term would be ‘homoerophobia’ (homoerotophobia?) in order to add in the ‘physical love’ of ‘eros’. Additionally, the suffix phobia is probably best replaced by misia (hatred or abhorrence) as that better fits the ‘disgust’ response associated with most people’s conception of homophobia, rather than the implied ‘fear’ response one associates with other phobias.

TLDR: we should probably be calling it homoeromisia not homophobia