the picture of the guy in the thumbnail looks similar to a character in a bl manga, I have got to say I almost thought it was the guy so when I saw the genre I was quite shocked, it is probably the same for those who thought it was bl. I don't think they meant any harm. but you are right they should check the tags and the genre before reading.
I was definitely out of line here, but it annoyed me that some people commented that this would be better if it was Bl. I noticed that some people deleted their comments after being called out about it. And I hope people wont judge this manga based on what preference they want the story to go through.
dammit i like yaoi, and I also love my straight romance mangas, but holy fuck if u read that this isnt yaoi then gtfo. Like people dont go to yaoi mangas and be like "damn I thought this is straight so i guess it sucks because it is."