Syag> Which is against the halacha of judging favorably
the question here is inverse – maris ayn is precisely that we should behave in a way that does not cause suspicions, we are not allowed to say – “let them judge me favorably”. If you agree with this halakha, then I presume you’ll change your position.
For example, we just learned in Daf Yomi Shekalim that a person in charge of money in Beis Hamikdash would go into the money room without pockets, short-cut hair, etc to avoid suspicions. They did not require him putting water into his mouth though – as he was supposed to say a brocha.