Only if you interject a pause after the beginning word "Hey".<quoted text>
Not to be picky but you're going to need a comma between the interjection "Hey" and the adjective "brainless".
Otherwise, the entire line is one clause and so the comma can come after the last word when you pause.
A greeting or a sentence addressed to someone at the beginning of a passage or a note has only 1 comma at the end of it as in formal letter writing.
It can be if it is used as a title or as a sobriquet that is addressed to a person and so in such a case it is always highlighted with the first letter of every word of the title beginning with a capital letter.<quoted text>
Additionally, in this context "brainless homo" isn't a proper noun so need not be capitalised.
Read the explanation above.<quoted text>
The same goes for fanatical.
Didn't you know that a common noun can used as a highlight or as a proper noun and as such it can then be written with the first letter of the word beginning with a capital letter?