If you're referring to the email which Radon responds to the technical details; I don't think it's fair to label it aggressively worded without mentioning that

If you're referring to the email which Radon responds to the technical details; I don't think it's fair to label it aggressively worded without mentioning that Amjad had essentially accused them of copying internal design decisions. Taken directly from the email; "but this feels weird/unethical since you worked for us and now are copying internal design decisions (even bad ones)". Could Radon's email be worded better to defuse the situation? Probably; but they are a fresh graduate just out of university and I think it's reasonable to hold Amjad to a higher standard.