Intro
I will bump into Ahmadis on social media who will eventually claim that their critics use harsh words towards them and etc.  However, most of these hard-core-robot-Ahmadis don’t know that MGA blamed his “foul-language” explicitly on the Quran…See the quote

The quote

“How openly the Holy Quran uses harsh language cannot remain unknown even to the most unintelligent and ignorant of people. For example, the civilized people of today consider it the height of abuse to curse someone. But the Holy Quran pointedly curses the unbelievers. It says: “These it is on whom is the curse of Allah and the angels and men, of all of them, abiding therein” [2:162-163], and: “These it is whom Allah curses, and those who curse, curse them too” [2:160]. Similarly, it is obvious that to liken a human being to a beast is a form of abuse. However, the Holy Quran not only calls them beasts but declares that the unbelievers and deniers are worse than all the creatures on the face of the earth, as it says: “Surely the vilest of beasts in Allah’s sight are those who disbelieve” [8:55]. In the same way, it is clear that it is against the manners of present day culture to make a particular person a target of abuse by taking his name or by referring to him, but in the Holy Quran God the Most High has applied to some the name Abu Lahab, and to some the titles dog and swine. Then Abu Jahal is well known as such.

Similarly, regarding Walid Mughira the harshest possible words are used which apparently are terms of filthy abuse, as it says: […Here the Quran 68:9–17 is quoted in Arabic…]. In other words, do not follow what these unbelievers say, who wish from the bottom of their hearts that you abstain from abusing their gods and disgracing their religion, so that then they shall also apparently approve your religion. Do not be misled by the slickness of their tongues. This man who has appealed for compromise is a man who takes false oaths, is of weak opinion, and a degraded individual. He indulges in fault-finding in others and causes division among people by back biting. He hinders from the path of goodness, is guilty of illicit sexual acts, in his character he is a man of the worst morals, and besides all that he is of illegitimate birth. Very soon We shall brand his snout, which has grown long like that of swine. By a long snout is meant adherence to the customs and codes of honour of society which are a hindrance to the acceptance of the truth.”

(Izala Auham Pages 25-29 Ruhani Khazain Volume 3 pages 115-117)