Why Imam Khomeini sometimes didn’t respond to greetings of residents in Najaf?

An Iraqi citizen has described very interesting memoirs regarding Imam Khomeini’s years of exile in Iraq and his stay in the holy city of Najaf. During a visit to Iran, the Iraqi guest recalled that sometimes Imam did not use to respond their greetings during unintended encounters.

Human societies must preserve Imam Ali (PBUH)’s legacy, Imam Khomeini explained

When did Imam Khomeini used to pay pilgrimage to Karbala?

When did Imam Khomeini used to pay pilgrimage to Karbala?; Memoirs about Imam Khomeini

Imam Rida (PBUH)'s holy shrine sources of divine mercies, abundance

Imam Khomeini’s spiritual heritage, mystical and divine aspects

Imam Khomeini defined genuine political facet

Imam Khomeini set patterns of simple life-style, exemplified divine spirituality

Leader calls for resistance against Saudi-UAE bid to split Yemen

Leader of the Islamic Revolution Ayatollah Seyyed Ali Khamenei warns that the Saudi regime and the United Arab Emirates (UAE) — which have been leading a military campaign against Yemen — are after partitioning the fellow Arab country, calling for strong resistance in the face of the plot.