Sentence:  He could talk morals to others in the grand manner, and with positive enjoyment, but to be <WSD>sermonized</WSD> himself secretly exasperated him because it constrained him and made him self-conscious. 
Meaning of the word marked with <WSD> tags:  To preach a sermon to (somebody); to give (somebody) instruction or admonishment on the basis of one's morality or opinions.