Synonyms of 'preachy'
His speech was tinged with a moralistic, preachy tone.
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He adopts a lofty, didactic tone when addressing women.
If you describe someone as holier-than-thou, you disapprove of them because they seem to believe that they are more religious or have better moral qualities than anyone else.
those with holier-than-thou attitudes
If you say that someone is sanctimonious, you disapprove of them because you think that they are trying to appear morally better than other people.
He writes smug, sanctimonious rubbish.
Thesaurus for preachy from the Collins English Thesaurus
inclined to or marked by preaching