Criticizing a single guy for wanting an 1100 sq ft house is silly. Nobody makes houses for single people, they're made for families. There are relatively few 2 bedroom SFH properties that haven't been turned into rentals. My places since college (excluding dorms):
2 people, ~800 sq ft 2 BR 1 BA apartment: Plenty big, but my roommate was a huge slob. Living room was only big enough for 3 or 4 people, no where to put a dinner table.
1 person, ~950 sq ft 2 BR 2 BA apartment: 2nd bathroom was mostly wasted space. 2nd bedroom was office/storage.
1 person, ~1400 sq ft 3 BR 2 BA SFH, 2 car garage: House sat for a friend. Way way too big. 3rd bedroom was completely empty. Formal dining room also empty.
1 person, 980 sq ft 3 BR 2 BA SFH, 1.5 car garage: 3rd bedroom was storage (which the rest of the house lacked). Probably about the right size for me - proper sized bedroom and office. Used the "dining room" as an extension of living room.
3 people, 2800 sq ft 4 BR, 6 BA SFH, 3 car garage: McMansion hell.
I opn't think the Sq footage included the basement, and it was more like 3600 sq ft. Also had a large screen porch and a larger patio. 4th bedroom was a guest room. Sitting room and living room very rarely used, except during parties. Two offices in basement got used a lot. I think this house needed about 6 people to be properly utilized. I could go weeks at a time without seeing my housemates.
3-4 people, 1500 sq ft 3 BR, 2 BA SFH, 2 car garage: '20s Seattle home, not particularly large. Good size.
3-4 people, 1600 sq ft, 3 BR, 2.5 BA SFH, 3 car garage: Newer Seattle home, almost perfect size, except I don't have an office (which is good in some ways, forced me to clean up my crap accumulated over the last decade). Supports parties of 50+ people, abundant storage.
I agree that it's a bit wasteful for a single person to live alone in a 3 bed room house. But if you're going to live alone in a SFH, 900-1100 sq ft is probably the size of home you'll end up in. 1500-1700 for 3-4 people seems to be about right. I had some friends with large families in 2500+ sq ft homes and even then it seemed like a big waste of space.