None of the examples you have listed appear to be fallacies. A fallacy is a persuasive, but poorly reasoned argument whose conclusion doesn't follow.
Not all mistakes or communications that are personal attacks are fallacies. In the examples you cite, there are certainly implications and implicatures. But to be a fallacy, there must be a deductive, inductive, or abductive inference involved.
A popular fallacy, for instance, is the straw man, where in argumentation, one comes to a conclusion by arguing against an argument that isn't actually made:
Socrates: I think we should allow Spartan immigrants to claim amnesty and live among us.
Plato: That's an interesting idea, however, but Spartans are loyal to their homeland and may come to the aid of Laconia were we to find ourselves at war.
Socrates: Nonsense. Every Spartan I know works hard. It's clear we could use hard workers.
Plato: I never said Spartans weren't hard workers!!!
Here, clearly, the riposte misses Plato's objection and draws a specious conclusion by arguing against a position Plato did not take. Now let's look at your first example:
A. A customer goes to buy an electronic device and upon receiving the item asks: "How long is the warranty period for this item?" to which the seller replies "If you don't 'fry' it, the period is 1 year." with a specific, bitter, unwarranted verbal emphasis on the first part. The original question didn't ask for judgement [sic] and there was no reason to suspect that said customer can damage the equipment on purpose or otherwise.
In this example, there is certainly an implication that the customer is likely to ruin the equipment. But, is there at least one stated premise and a conclusion drawn from it? I don't see it. If it had gone:
Clerk Yes, there does, and you'll be back to use it, won't you?
Here we have an inference with an enthymeme that goes along the lines of:
- P1. There is a warranty.
- P2. (You'll break the equipment.)
- C. Therefore, you'll be back to use the warranty.
Is this fallacious? Depends! Maybe this customer has a habit and a reputation of doing so. Maybe this customer is of a different ethnic group and the presumption is she is of lower intelligence. Perhaps the implication is that the breakage that occurs is because of the poor quality of the equipment and there's a 75% chance as 3 out 4 models fail during the warranty. Context, not content!
There is an 'if' in your example, and the clause certainly seems presumptuous and insulting, but the single statement is a proposition, and it takes multiple propositions to form an argument. So we do have a conditional statement, and we do have an insult; it is understandable to see why you might have the impression it is a fallacy. But is it an ad hominem? Once again, an ad hominem is a type of faulty inference.
Not Ad hominem You're a moron. The answer you give is wrong.
Ad hominem You're a moron (and morons give wrong answers), therefore the answer you give is wrong.
This is a subtle but important distinction. For instance, if a person is slow, and does come up with a wrong answer, then in the first case, what we have is an insult and a statement of fact, not a fallacy. A person adds two and two and says five! The person is insulted, and called out for making an error, and as rude as this is, it's simply not an inference.
Damer, T. Edward. Attacking Faulty Reasoning
Bennett, Bo. Logically Fallacious: The Ultimate Collection of Over 300 Logical Fallacies