You really don't live in the real world, do you? Yes, social housing must be very distressing for you to look at. Poor you.
That's the whole point @Mercurial123 - I don't have to look at it. But the people who live there do, and I think they are entitled to something whose appearance has been considered.
To everyone else - you make some good points and some unfair ones and sorry to respond with bullet points rather than individually. I definitely don't believe myself to be an arbiter and of course what is considered beautiful changes over time and amongst different cultures etc. But what it all has in common is that it has been carefully considered - and I think you can, actually, say that there are some 'rules' in terms of what most humans find compelling and harmonious in terms of colour, proportion and the relations between the elements. The things that I dislike are those where there has been no consideration at all, when it would have cost no more to do it well - or where there's been a cynical attempt to cash in with a bad 'get the look' pastiche of something better.
in terms of architecture specifically - of course generally form must follow function. A building that makes it difficult to do what it's intended for is a bad building. Conversely a building which perfectly fulfils its purpose has a kind of beauty by default. An excellent building has done this and resolved details and proportions with consideration. Buildings of almost any style or period can be aesthetically admirable if they have all these qualities - everything else is taste. Brutalism is an interesting example - I like the boldness of the aesthetic and the honest use of materials (not trying to hide the concrete with cladding for example) of the South Bank but depressed by the naivety/lack of care shown by the architects who thought humans would not feel oppressed by its monolithic scales.
In terms of art - or rather contemporary art - I think this is slightly different, in that part of its raison d'etre is in playing with or challenging orthodoxy. Some of the art I like most could be considered ugly but it is aesthetically interesting and exciting to me because it challenges our expectations. Again, it's the product of thought and care - you cannot successfully make art, I don't think, without understanding 'the rules' at some level, even if not formally educated in them.
'Elite aesthetes' strikes me as both unfair and depressingly populist - look at those snobs looking down on you all, as the likes of Trump and Farage like to say to distract from the real shit. I definitely don't consider myself superior - as I said earlier, I think it's quite randomly assigned, like other qualities. DH is very musical, for eg, and can hear when something is slightly out of tune when I just can't - I don't consider him better than me at all
.