Why? Would you find their presence offensive? Perhaps you should go and live in Poland or Hungary where you're most unlikely to see anyone whose skin colour is darker than your own. I and the entire Maltese population are very thankful that you think as you do and pleased that you stay away from these islands. We wouldn't want you enjoying yourself.
You should, Dom, if only to sample the local wines. Those I've tasted have been excellent including a very nice (but rather young) Merlot costing a couple of quid. A litre!
No I would not find their presence offensive. It is you who seems to want to apply a xenophobic approach to immigration. What I find offensive is that you on the one hand advocate the prevention of immigration to the UK, to the point of excessively campaigning for Brexit but on the other hand turn a blind eye to it happening in that part of the EU (you know the very EU that you denigrate) that you have elected to emigrate to.