I honestly thought you were going to say the colleague called it unhealthy because they thought you weren’t eating enough. I’ve seen other threads where colleagues are making comments about an OP not eating enough following a diet shift.
Didn’t see the criticism of low fat cottage cheese and hummus coming!
Like others have said, if you’re looking to follow a new diet then do some reading, try not to massively cut out any food groups especially straight away, and keep an eye on your progress or changes in general - eg weight loss, inch loss, energy levels, complexion, cravings etc.
IMO the healthy diet for a person is one that is relatively balanced in terms of nutrition sources (eg fats, protein, carbs, fibre etc), is one they find easy to follow (ie it comes fairly naturally to them), and leaves them feeling well, sufficient energy, not hungry or cranky. That varies by person for all sorts of reasons. For me, it’s low carb (especially low sugar) and high fat, with a good array of dairy and vegetables, some meat/fish, some nuts, some low sugar fruits (like berries). For me, this leaves me feeling satisfied, fits my natural food preferences/palate (don’t care about not having a bowl of pasta for instance, but feel deprived without cream and cheese!), leaves me with plenty of energy, not bloated, no cravings, and a healthy weight. The added bonus is my complexion is better since having moved to this. But, not everyone would feel the same, so the key is finding what works for you.