singlephobia
prejudice or negative beliefs against single people, or fear and hostility of being single
"Those 2 couples were so rude to me when I was at the coffee shop. They were staring at me differently because I enjoyed going single. Seems like they got a case of singlephobia."
John needs to find a mate real soon. He often suffers from singlephobia.
John needs to find a mate real soon. He often suffers from singlephobia.