Having considered this incident its actually a bit bizzare that it's been labeled variously a 'homophobic' and/or a 'misogynistic' incident
As it doesn't appear to have been based on a fear/disgust (be it irrational or rational) of homosexual women (as a description as it being homophobic would suggest) or be based on hatred, contempt or prejudice against women (as misogyny would suggest).
Rather the incident seems to be at least partially the result of a lack of respect for women (quite possibly from people who don't have much respect for any other people)
Its possible that the couple being gay was rather incidental to the actual motivation for the attack and that two or more, heterosexual women could easily have been the target...
Get your ***s out (as a certain forum member might joke)?
Or even a heterosexual couple. Getting grief from a bunch of imbeciles.
I have seen example of both of the above on public transport.
Without further information it appears that it could be a case that the suspects saw the women clocked they were gay (possibly because they kissed each other) and decided to harass them by trying to get them to act in a sexualised manner and when rebuffed it escalated to abuse, items being thrown and finally assault and robbery.
This isn't necessarily homophobic any more than an incident where a couple consisting of a male and female could be targeted by a group (as per the example cited above by another poster) could be considered 'heterophobic'
The initial linked article talks about 'homophobic abuse' but doesnt actually seem to include any actual examples of this (I don't think calling a lesbian a lesbian really counts as homophobic abuse) . Rather just the suspects acting lewdly and trying to incite the women to act in a sexual manner.
In a Facebook post, Geymonat, a flight attendant originally from Uruguay, said in both English and Spanish that they were subjected to homophobic abuse while being beaten up: “They started behaving like hooligans, demanding that we kissed so they could enjoy watching, calling us ‘lesbians’ and describing sexual positions … The next thing I know is that Chris is in the middle of the bus fighting with them.