All the revered preachers of the Sanatana Dharma are called 'Mahapurusha'-s.
According to the Samudrika-grantha quoted in Sri Chaitanya Charitamrita, the features of a 'Mahapurusha' are
pancha-dirghah pancha-sukshmah sapta-raktah sad-unnatah/tri-hrasvah prithu-gambhiro dvatrimsal-lakshano mahaan//
In them, three things are gambhira : navi, swara and buddhi.(Mahaprabhu Sri Chaitanya, Radhagovinda Nath, Sadhana Prakashani, page 145).
It is obvious that no one with 'Gambhira-Buddhi' can use ill words against any one.
Gita also says:
अद्वेष्टा सर्वभूतानां मैत्रः करुण एव च।
निर्ममो निरहङ्कारः समदुःखसुखः क्षमी।।12.13।।
सन्तुष्टः सततं योगी यतात्मा दृढनिश्चयः।
मय्यर्पितमनोबुद्धिर्यो मद्भक्तः स मे प्रियः।।12.14।।
12.13 He who is not hateful towards any creature, who is friendly and compassionate, who has no idea of 'mine' and the idea of egoism, who is the same under sorrow and happiness, who is forgiving; 12.14 He who is ever content, who is a yogi, who has self-control, who has firm conviction, who has dedicated his mind and intellect to Me-he who is such a devotee of Mine is dear to Me.
None of the great Acharyas attacked any other Acharya personally.They only logically upheld their views against others' doctrine. Use of ill words for personal attacks seem unthinkable for them.
The signs of a 'Sadhu' mentioned in the Mahabharata are
Na prahrishyati sammaane naavamaane cha kupyati/na kruddhah parusham bruyat iti etat sadhulakshanam
meaning a Sadhu is never happy by honour and angry by insult.He never becomes fury and utter ill words-- these three are signs of a Sadhu (Reference: Omkarnath Rachanavali, vol 1, page 427).
So I think the answer is a big NO.