Some people do have unsightly feet. This is because of age, illness, injury or just wearing daft high heels. However, most people do not have feet like this.
When people say that feet are an ugly part of the body, just what do they think feet ought to look like? Would they rather have cloven hooves or pig's trotters? Or how about wheels?
I find it especially strange when Christians make this comment. They are effectively scorning the Creator's handiwork.
Our Lord Jesus walked this earth on human feet and now His feet are as burning brass (Revelation 1:15). When the saints are resurrected to glory, they will perhaps have feet of the same quality.
I believe the angels of heaven are not purely spirits, but have bodies that are in some ways like ours. I am sure they have feet like ours.
"How beautiful are the feet of them that preach the gospel of peace and bring glad tidings of good things!"
If anyone thinks that feet cannot be beautiful, I suggest that they be locked up for a week in an art gallery filled with paintings by William Adolphe Bouguereau.