Answer:
The main problem with the critique is the following one:
d. It is not ethical.
Step-by-step explanation:
The word choice and tone are completely unethical, since the critique is aggressive, excessively harsh and rude. That is not how feedback is supposed to be given. In order to be constructive, a critique must point out not only what could have been better, but also what must be done so those aspects can be improved. Therefore, calling someone's speech "stupid", calling the speaker "boring", and saying nobody cares about the topic is definitely not the way to go if one wants their critique to be ethical.