I appreciate your insinuation about my "likes". I don't really have anything "liked" on my Facebook but please, go ahead and tell me about how my personal preferences are affecting my online experience.
I'm happy that your anecdotal experience was different from mine, but your empirical evidence does not undermine mine.
Facebook tends to base these ads around collected data and demographics, the targeting is not generally random. Perhaps other sites you've browsed that share data with Facebook's advertising network?
I suppose there's also the possibility of malware replacing FB's ads with their own.
I'm happy that your anecdotal experience was different from mine, but your empirical evidence does not undermine mine.
Good day sir.