It's strange advise. Is it ever possible to be sure of what anyone is thinking about whatever I'm doing?
Wouldn't it be kinda creepy to be able to control other people's minds?
Doesn't the evidence of life experience suggest that people are going to think whatever they think?
And, I don't know about you, but I'm willing to take the risk of being surprised by other people's responses. In a very real and time-tested way, other people's unmediated reactions and responses help me know who I am.