A candidate who was rejected came to the office.

I had rejected someone a month ago after a screening call. I enjoyed the conversation, but they didn't have the required experience – I briefly explained this in the rejection email that was sent at the appropriate time.

I didn't get a reply, and then last week, they came to the office asking for me, but I was WFH that day.

Is it harsh for me to consider this strange and annoying and put the candidate on a blacklist so they don't come again?

The issue has escalated, with very strong opinions for and against.

About 70% supported this stance, while 25% said that blacklisting was too harsh.

I sent an email to the candidate to clarify again that this was a rejection and to please schedule an appointment in the future. They misled security to get through (I know, the security is bad).

1% of people responded aggressively, saying that recruiters are devils and that I have to deal with this person regardless of their intentions. Frankly, this supports my original stance. The candidate is very likely acting in good faith, but I'm not willing to take the risk.

Edit : I was going through some old posts and found a subreddit reddit.com/r/interviewhammer where people with tons of experience still get help during interviews. Makes you wonder how much these interviews actually test real skills.