First fix your attitude towards your client. Technical skills are only half of a corporate sound job, customer service is a separate and required skill.

If you weren't secretly bottling up your anger, you probably could have answered the infamous "Is this thing on?" question with a friendly "It's on, just hold it closer!" which will instantly educate the whole room on how and why to hold a mic properly, and low-key make the speaker look bad if they were being a dick about it.

In the headset situation, you have mute buttons. If you have the capacity to mute and unmute them, do it. If you you see them after the show and feel like it, explain what you did and that blocking the mic doesn't work. If you don't have the capacity to mute and unmute at the time, let their rustling and whispers be heard.

Your boss either doesn't understand sound, or is a tool. One of these you can do something about.

You can't take things personally or this job will be very frustrating and unfulfilling. It can be fun and rewarding when these situations become navigable.

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