sequence of personal pronouns

[Teo]

The normal sequence of personal pronouns is as follows:

singular: [you, (s)he and I]; plural [we, you and they]

However, according to Treasury of English Grammar, when we want to express something unpleasant,

the sequence of personal pronouns is as follows:

singular [I, (s)he and you]; plural [they, you and we]

For example,

I, he and you will be punished for being late.

They, you and we should leave there at once.

Can any native speaker tell me whether the above rules are true or not?
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Thank you very much for your reply.

[Alan]

These are not grammar rules but conventions of usage.

You would probably do well to follow them, but you will not be grammatically 'incorrect' if you do not.